A person's heart beats approximately 10⁵ times a day.
10⁵ in figures is 100000 beats each day.
A person lives for approximately 81 years.
So, now take your answer from before and multiply it by 81: 100000 × 81 = 8100000.
To change your answer to standard form, you make it into a decimal which is not greater than 9, so, 8.1 × 10⁶
And that is your answer: 8.1 × 10⁶.
